Sudanese security forces killed at least one person near a sit-in outside the military's headquarters in the capital, Khartoum, the Sudan Doctors Committee said.
The medical union said the shooting took place late Saturday on Nile Street and that at least 11 people were wounded.
Two people were also killed in the area last week, the Associated Press reported.
The doctors committee is part of the Sudanese Professionals Association, which has been leading the protests that led to the military overthrow of longtime ruler Omar al-Bashir in April.
Tens of thousands have staged a sit-in outside the military headquarters since April 6, following nearly four months of protests against al-Bashir.
